So you lose 1,000rpm in spool to him and about 35wtq. Ouch.
You're looking at the Kinugawa housings for the GT28RS? I don't see one in their range that has a Subaru style flange, only T25/Silvia types.
The fact that many revolutionary new ideas were at first ridiculed is no proof that the 'new' ideas you're being ridiculed for now are indeed visionary.